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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Treasury Stock
Additional Paid-in Capital
Retained Earnings (Accumulated Deficit)
Accumulated Other Comprehensive Income
Total
Balance at the beginning of the period at Dec. 31, 2014 $ 404   $ 750,139 $ (13,080) $ 1,469 $ 738,932
Balance (in shares) at Dec. 31, 2014 40,360          
Increase (Decrease) in Stockholders' Equity            
Net loss       (31,978)   (31,978)
Other comprehensive income (loss), net of tax         (121) (121)
Share-based compensation expense     17,986     17,986
Net issuance under employee stock plans $ 6   (988)     (982)
Net issuance under employee stock plans (in shares) 636          
Purchases of common stock   $ (9,222)       (9,222)
Purchase of common stock (in shares)   469        
Balance at the end of the period at Dec. 31, 2015 $ 410 $ (9,222) 767,137 (45,058) 1,348 714,615
Balance (in shares) at Dec. 31, 2015 40,996 469        
Increase (Decrease) in Stockholders' Equity            
Net loss       (122,210)   (122,210)
Other comprehensive income (loss), net of tax         429 429
Share-based compensation expense     15,741     15,741
Net issuance under employee stock plans $ (3) $ 19,948 (20,890)     (945)
Net issuance under employee stock plans (in shares) (281) (1,072)        
Purchases of common stock   $ (13,035)       (13,035)
Purchase of common stock (in shares)   730        
Balance at the end of the period at Dec. 31, 2016 $ 407 $ (2,309) 763,303 (168,583) 1,777 594,595
Balance (in shares) at Dec. 31, 2016 40,715 127        
Increase (Decrease) in Stockholders' Equity            
Cumulative effect of change in accounting principle - adoption of ASU 2016-09     1,315 (1,315)    
Net loss       (44,793)   (44,793)
Other comprehensive income (loss), net of tax         35 35
Share-based compensation expense     24,396     24,396
Net issuance under employee stock plans $ 3 $ 4,043 (9,795)     (5,749)
Net issuance under employee stock plans (in shares) 313 (245)        
Stock issuance for business acquisition $ 72   228,800     228,872
Stock issuance for business acquisition (in shares) 7,201          
Convertible Senior Notes, equity component     46,375     46,375
Purchases of common stock   $ (3,018)       (3,018)
Purchase of common stock (in shares)   203        
Balance at the end of the period at Dec. 31, 2017 $ 482 $ (1,284) $ 1,053,079 $ (213,376) $ 1,812 $ 840,713
Balance (in shares) at Dec. 31, 2017 48,229 85